At Shinwa’s wholesale distribution center, a simple measuring rod is attached to mobile online receiving workstations, allowing receiving operators to quickly classify each incoming pallet into one of five color codes based on its height (Figure 4.17. Different color strips are placed on the antenna so that the receiving operator can easily classify the height code of the pallet, enter the code into the onboard warehouse management system terminal, and assign the load to its corresponding pallet height opening. The codes correspond to the color-coding scheme used to distinguish the sizes of rack openings throughout the warehouse.